diff --git a/.gitignore b/.gitignore
index 64f7514..861961d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 .bundle
 .idea
 Gemfile.lock
+gemfiles/*.lock
 pkg/*
 
 doc
diff --git a/Rakefile b/Rakefile
index 8c20299..6402da8 100644
--- a/Rakefile
+++ b/Rakefile
@@ -11,6 +11,22 @@ end
 
 task :default => :spec
 
+namespace :spec do
+  %w(active_record_32 data_mapper_12 mongoid mongo_mapper).each do |gemfile|
+    task gemfile do
+      sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle --quiet"
+      sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle exec rake -t spec"
+    end
+  end
+
+  task :all do
+    %w(active_record_32 data_mapper_12 mongoid mongo_mapper).each do |gemfile|
+      sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle --quiet"
+      sh "BUNDLE_GEMFILE='gemfiles/#{gemfile}.gemfile' bundle exec rake spec"
+    end
+  end
+end
+
 require 'rdoc/task'
 
 Rake::RDocTask.new do |rdoc|
diff --git a/gemfiles/active_record_32.gemfile b/gemfiles/active_record_32.gemfile
new file mode 100644
index 0000000..147bc39
--- /dev/null
+++ b/gemfiles/active_record_32.gemfile
@@ -0,0 +1,7 @@
+source :rubygems
+
+gem 'railties', '>= 3.2.3'
+gem 'activerecord', '>= 3.2.3', :require => 'active_record'
+gem 'rspec-rails', '>= 2.0'
+
+gemspec :path => '../'
diff --git a/gemfiles/data_mapper_12.gemfile b/gemfiles/data_mapper_12.gemfile
new file mode 100644
index 0000000..2e0919c
--- /dev/null
+++ b/gemfiles/data_mapper_12.gemfile
@@ -0,0 +1,12 @@
+source :rubygems
+
+gem 'railties', '>= 3.2.3'
+gem 'dm-core', '>= 1.2.0'
+gem 'dm-migrations', '>= 1.2.0'
+gem 'dm-aggregates', '>= 1.2.0'
+gem 'dm-transactions', '>= 1.2.0'
+gem 'dm-active_model', '>= 1.2.0'
+gem 'dm-sqlite-adapter', '>= 1.2.0'
+gem 'rspec-rails', '>= 2.0'
+
+gemspec :path => '../'
diff --git a/gemfiles/mongo_mapper.gemfile b/gemfiles/mongo_mapper.gemfile
new file mode 100644
index 0000000..64b404e
--- /dev/null
+++ b/gemfiles/mongo_mapper.gemfile
@@ -0,0 +1,7 @@
+source :rubygems
+
+gem 'railties', '>= 3.2.3'
+gem 'mongo_mapper', '>= 0.11.0'
+gem 'rspec-rails', '>= 2.0'
+
+gemspec :path => '../'
diff --git a/gemfiles/mongoid.gemfile b/gemfiles/mongoid.gemfile
new file mode 100644
index 0000000..7ec4556
--- /dev/null
+++ b/gemfiles/mongoid.gemfile
@@ -0,0 +1,7 @@
+source :rubygems
+
+gem 'railties', '>= 3.2.3'
+gem 'mongoid', '>= 2.4.0'
+gem 'rspec-rails', '>= 2.0'
+
+gemspec :path => '../'
diff --git a/kaminari.gemspec b/kaminari.gemspec
index 22e50fc..93e280c 100644
--- a/kaminari.gemspec
+++ b/kaminari.gemspec
@@ -21,25 +21,15 @@ Gem::Specification.new do |s|
 
   s.licenses = ['MIT']
 
-  %w{ activesupport actionpack railties }.each do |gem|
-    s.add_dependency gem, ['>= 3.0.0']
-  end
+  s.add_dependency 'activesupport', ['>= 3.0.0']
+  s.add_dependency 'actionpack', ['>= 3.0.0']
+
   s.add_development_dependency 'bundler', ['>= 1.0.0']
+  s.add_development_dependency 'rake', ['>= 0']
   s.add_development_dependency 'sqlite3', ['>= 0']
-  %w{ activerecord activemodel }.each do |gem|
-    s.add_development_dependency gem, ['>= 3.0.0']
-  end
+  s.add_development_dependency 'tzinfo', ['>= 0']
   s.add_development_dependency 'sinatra', ['>= 1.3']
-  s.add_development_dependency 'mongoid', ['>= 2']
-  s.add_development_dependency 'mongo_mapper', ['>= 0.9']
-  s.add_development_dependency 'dm-core', ['>= 1.1.0']
-  s.add_development_dependency 'dm-migrations', ['>= 1.1.0']
-  s.add_development_dependency 'dm-aggregates', ['>= 1.1.0']
-  s.add_development_dependency 'dm-transactions', ['>= 1.1.0']
-  s.add_development_dependency 'dm-active_model', ['>= 1.1.0']
-  s.add_development_dependency 'dm-sqlite-adapter', ['>= 1.1.0']
   s.add_development_dependency 'rspec', ['>= 0']
-  s.add_development_dependency 'rspec-rails', ['>= 0']
   s.add_development_dependency 'rr', ['>= 0']
   s.add_development_dependency 'capybara', ['>= 1.0']
   s.add_development_dependency 'database_cleaner', ['>= 0']